Yes I thought they were wrong, I did have a close look in case some clever clogs had secured it with a hole and split pin but no, Not a problem I have plenty of BSF hardware being a Vincent owner.
I couple of fins have bit missing I was going to get them laser welded but the quote was £200! I have made some replacements in cast iron but welding them up seems tricky there are some reports that a dab dab spot approach with Tig is the way to go?